Gamma Ursae Majoris
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Ursa Major |
| Right ascension | 11h 53m 49.8s |
| Declination | +53° 41' 41" |
| Apparent magnitude (V) | +2.41 |
| Characteristics | |
| Spectral type | A0Ve SB |
| U-B color index | 0.02 |
| B-V color index | 0.00 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | −13 km/s |
| Proper motion (μ) | RA: 107.8 mas/yr Dec.: 11.16 mas/yr |
| Parallax (π) | 38.99 ± 0.68 mas |
| Distance | 84 ± 1 ly (25.6 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.36 |
| Details | |
| Mass | 2.7 M☉ |
| Radius | 3 R☉ |
| Luminosity | 72 L☉ |
| Temperature | 9500 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
Gamma Ursae Majoris (γ UMa / γ Ursae Majoris) is a star in the constellation Ursa Major. It also has the traditional names Phecda, Phekda or Phad and comes from the Arabic word فخذ fakhdh [faxð], "thigh" (of the Great Bear).
It is more familiar to most observers in the northern hemisphere as the lower-left star forming the bowl of the Big Dipper, together with Dubhe (upper-right), Merak (lower-right) and Megrez (upper-left). Along with four other stars in this well-known asterism, Phecda forms an actual loose, open cluster of stars known as the Ursa Major moving group. Like the other stars in the cluster, it is an average main sequence star not unlike our Sun, although somewhat hotter, brighter and larger.
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